re the close vote. This is a good question, simply looking up cavernous in the dictionary would suggest a room like a cave = dark rough, crude and cramped. Rather than it's normally figurative meaning of very very large.
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mgbJul 6 '11 at 16:01

@Martin Beckett: i.e. like a cavern.
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user1579Jul 6 '11 at 16:32

If you are a spelunker, cave has an image of tight, cramped, dirty and uncomfortable, not cathedral like!
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mgbJul 6 '11 at 16:39

1

Sorry, looking up "cavernous" should lead you to "cavern", not "cave".
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user1579Jul 6 '11 at 16:46

Absolutely. I doubt very much that the writer in this case intended any troglodyte associations such as primitive, dark, underground. Large, opulent, light, and sparsely-furnished, more likely.
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FumbleFingersJul 6 '11 at 15:20